Sat-Chit-Ananda-Self Siva and His Worship

The Ribhu Gita (ऋभुगीता) forms the sixth part of Siva Rahasya Purana. It details in about two thousand verses the dialogue on the Self and Brahman between Sage Ribhu (who in turn heard it from Lord Shiva Himself) and Sage Nidagha on the slopes of the Mount Kedara in the Himalayas. (source: wikipedia). 

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• On the eternal and infinite screen of Sat-Chit-Ananda-Self Siva, by His own power, Sakti is projected as the moving shadow picture of the universe in manifestation and into that again it is absorbed in dissolution. All luminaries like the sun, moon, fire, stars and lightning derive their luminosity as a gracious gift from the Sakti inherent in that screen of Self-Siva only. Though bright in themselves, they can only obscure and cannot reveal the Siva-Screen which they cover up. Out of fear of that Siva, their creator, Devas and Asuras are ever alertly engaged in their ordained duties. 
• That Siva must be meditated upon and realized to be the Self, by making the restless mind stay still and alert after it has been adequately restrained, and completely prevented from the pursuit of sense objects, namely, the shadow pictures on the screen of the Self. All shadow pictures removed, what remains is pure Awareness, the spotlessly effulgent screen. Thus, Siva reveals Himself spontaneously as the sole eternal Sat-Chit-Ananda-Self, the very essence of the nature of the worshipper.

From "The Essence of Ribhu Gita" by Prof. N. R. Krishnamurthi Aiyer